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This module performs quoted-printable transport encoding and decoding, as
defined in RFC 1521: “MIME (Multipurpose Internet Mail Extensions) Part One:
Mechanisms for Specifying and Describing the Format of Internet Message Bodies”.
The quoted-printable encoding is designed for data where there are relatively
few nonprintable characters; the base64 encoding scheme available via the
base64 module is more compact if there are many such characters, as when
sending a graphics file.

Decode the contents of the input file and write the resulting decoded binary
data to the output file. input and output must be file objects. input will be read until input.readline() returns an
empty string. If the optional argument header is present and true, underscore
will be decoded as space. This is used to decode “Q”-encoded headers as
described in RFC 1522: “MIME (Multipurpose Internet Mail Extensions)
Part Two: Message Header Extensions for Non-ASCII Text”.

Encode the contents of the input file and write the resulting quoted-printable
data to the output file. input and output must be file objects. input will be read until input.readline() returns an
empty string. quotetabs is a flag which controls whether to encode embedded
spaces and tabs; when true it encodes such embedded whitespace, and when
false it leaves them unencoded. Note that spaces and tabs appearing at the
end of lines are always encoded, as per RFC 1521. header is a flag
which controls if spaces are encoded as underscores as per RFC 1522.

Like encode(), except that it accepts a source string and returns the
corresponding encoded string. quotetabs and header are optional
(defaulting to False), and are passed straight through to encode().